2004 Toyota Tundra spark plug

One of my spark plug literally shot out of the cylinder head. I was driving about 65 mph and I heard this loud banging noise. I thought that my tire was going to fall off. It happened to be one of the spark plugs that came comletely out. What would cause this? I have to have the cylinder head rethreaded to have the spark plug replaced.

Here is an updated. The cylinder had to be rethreaded and the spark plug and plug wires replaced. They stated possible spark plug was loose and damaged cylinder head from vibration. Another company had replaced the spark plugs with Autolite spark plugs in 5/2007. The spark plug blew out after putting 29641 miles. When I went back to the company that had installed the spark plugs they said that it was outside of the warranty and the the cause was due to metal fatique on the cylinder and not because the spark plug was installed incorrectly. He kept repeating that it worked fine for 30000 miles. I do not know if there were threads left in the cylinder when the spark plug blew out. What causes metal fatique and how can I determine the cause. Should I contact the company to see if there were threads in the cylinder head before it was rethreaded?Here is an updated. The cylinder had to be rethreaded and the spark plug and plug wires replaced. They stated possible spark plug was loose and damaged cylinder head from vibration. Another company had replaced the spark plugs with Autolite spark plugs in 5/2007. The spark plug blew out after putting 29641 miles. When I went back to the company that had installed the spark plugs they said that it was outside of the warranty and the the cause was due to metal fatique on the cylinder and not because the spark plug was installed incorrectly. He kept repeating that it worked fine for 30000 miles. I do not know if there were threads left in the cylinder when the spark plug blew out. What causes metal fatique and how can I determine the cause. Should I contact the company to see if there were threads in the cylinder head before it was rethreaded?

The causes for spark plugs leaving the cylinder head are as follows:
1. The threads in the cylinder head were compromised, as in cross-threading.
2. The spark plug, when replaced, was not tightened down properly (like only 2-3 threads in)
3. A combination of the above.

Whe the plugs are fully seated in the cyl heads, and are at the proper torque, it would be extremely RARE for the plug to be jettisoned by the compression of the pistons. You only have roughly 175-185 PSI compression, this will NOT defeat the retention of the threads. Look at the hole in the head...How may threads are damaged? If it is just the end of the hole, the plugs was not in "all of the way". If ALL of the threads are bad, the plug was inserted improperly, and damaged the threads in the head. Rethreading (a "heli-coil") will correct you condition, if properly done.
Hope this helps.

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CarGurusDec 1, 2014 - 10 mph a very loud snap bang from under the cab (I think) now... ...Could probably hear it from 50 to 75 ... truck - no cut wires - i have no power to my 4 wheel drive button on the inside of my truck ? any ... Used Cars For Sale.

Code 0308 indicates a misfire was detected in cylinder 8. You say you checked the fuel injector and it is OK. Other probable causes include:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Ignition system wires
4. Fuel system

To reliably check the head gasket without costing you a cent, idle the car hot, to opperating temp. then one by one loosen the spark plugs.

It is very important that you dont take out all the spark plugs at once.

Start with cylinder 1

Loosen the sparg plug
Have a mirror nearby (one that will fit over the plug hole closely)
Remove the spark plug
and then quickly place the mirror over the spark plug hole
after 3-4 seconds quickly check on the mirror if there is any sign of moisture.
If so the head gasket is blown on that cylinder

When the head gasket blows moisture escapes into the combustion chamber wich will mist up the mirror glass.

If the engine is the same as my 2002, they are a Hemi-style which go right into the valve covers, hidden under the individual coil packswhich can be removed by loosening one nut I believe. After you remove the nut, pull straight out and you will see the Spark plug cap is attacked to the bottom of the coil pack, use an extension and a spark plug socket preferably with a rubber grommet inside it or you will play hell getting the plugs out of the wells once they are loose.

The plugs are in the cylinder head, there are thick wires going to them with a long rubber boot on the cylinder head end, carefully pull the plug boots off, if you damage them you must replace them, under them is a spark plug, you will need the proper tools, 3/8" drive plug socket, a few different length 3/8" drive extensions and a 3/8" drive ratchet wrench.